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Consolidated Statements of Operations (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Net sales $ 34,223,772 $ 30,915,122
Cost of goods sold 26,572,370 24,265,598
Gross profit 7,651,402 6,649,524
Selling and administrative expenses 5,186,760 5,033,451
Operating profit 2,464,642 1,616,073
Other income:    
Interest income 34,138 42,282
Gain from disposal of property and equipment 67,946 192,544
Other nonoperating income 16,015 14,978
Income before provision for income taxes 2,582,741 1,865,877
Provision for income taxes 837,000 611,000
Net income $ 1,745,741 $ 1,254,877
Average common shares outstanding 966,132 966,132
Earnings per share $ 1.81 $ 1.30
Cash dividends declared per share $ 0.90 $ 0.51